Kali Chaudas as the name indicates is dedicated to Goddess Kali and is observed on the 14th day of Ashwin month mainly in Gujarat. Kali Chaudas 2015 date is November 10. The auspicious day, which falls a day before Diwali, is dedicated to the worship of Goddess Mahakali. In Gujarat, the day is also dedicated to Hanuman worship.

Usually, Narak Chaturdashi is observed on Kali Chaudas day.

It must be noted that the Amavasi in the month of Ashwin is dedicated to Kali Puja in eastern parts of India - this is on November 11, 2015. Diwali day is dedicated to worship of Kali in Bengal, Orissa, Jharkhand and Assam. Tantric practitioners perform special pujas on the day.